NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Rolling Cruise Ship
From: hellos
Date: 2006 Jul 26, 21:15 -0500
Very interesting. How did you happen to have a GPS running and with enough sky
to get bearings?
A little very crude photogrammetry:
The pool appears to be about 15' wide excluding the sit-rims sections. And,
from the exposed ladder, if I estimate each step to be about 6" apart and three
to four steps exposed to what had been the fill level in the earlier picture...
I get a right triangle somewhat like this during the splash:
| \.....
| ..\..........15' pool width
| \...........
|---------------------------------*-\- waterline when tilted
2' tall
So I have a base side of 2' and hypoteneuse at 15'...
Sin* = opposite/hypoteneuse = 2/15= 0.1333
And the angle becomes about 8 degrees if I've done that right.
Admittedly VERY crude and done with a fast eye instead of proper measurements
from the photos, but at eight degrees that's still only half of the fifteen(?)
degrees that the cruise line states now. I haven't heard if there was a tilt
recorder aboard or whether the results of that will be released but the rubrick
of "it was human error" should have scared the pants off anyone on future
cruises, since the error appears to be one that is being commonly made and
therefore all the more likely to be made again.
If anyone wants to print out the photos and try refining that
measurement...Please do!
Anyone know the standard separation of pool ladder steps?<G>
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to NavList@fer3.com
To , send email to NavList-@fer3.com
-~----------~----~----~----~------~----~------~--~---
From: hellos
Date: 2006 Jul 26, 21:15 -0500
Very interesting. How did you happen to have a GPS running and with enough sky
to get bearings?
A little very crude photogrammetry:
The pool appears to be about 15' wide excluding the sit-rims sections. And,
from the exposed ladder, if I estimate each step to be about 6" apart and three
to four steps exposed to what had been the fill level in the earlier picture...
I get a right triangle somewhat like this during the splash:
| \.....
| ..\..........15' pool width
| \...........
|---------------------------------*-\- waterline when tilted
2' tall
So I have a base side of 2' and hypoteneuse at 15'...
Sin* = opposite/hypoteneuse = 2/15= 0.1333
And the angle becomes about 8 degrees if I've done that right.
Admittedly VERY crude and done with a fast eye instead of proper measurements
from the photos, but at eight degrees that's still only half of the fifteen(?)
degrees that the cruise line states now. I haven't heard if there was a tilt
recorder aboard or whether the results of that will be released but the rubrick
of "it was human error" should have scared the pants off anyone on future
cruises, since the error appears to be one that is being commonly made and
therefore all the more likely to be made again.
If anyone wants to print out the photos and try refining that
measurement...Please do!
Anyone know the standard separation of pool ladder steps?<G>
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to NavList@fer3.com
To , send email to NavList-@fer3.com
-~----------~----~----~----~------~----~------~--~---